I’ve met this situation when working with a Thing, took a while to understand how to fully work with them and eventually I made sense of it being then able to properly handle a Thing, but in this case it goes haywire without even typing any code into the element action code box! Like this:

And I use this when I want to grab a Thing inside of another Thing’s field:

let getThingCeption = (firstThing, fieldOfTheFirstThing) => {
let returnedPropertyValue = firstThing.get(`${fieldOfTheFirstThing}`);
console.log(returnedPropertyValue.listProperties());
console.log(returnedPropertyValue.get("nome_text"));
}
getThingCeption(support4, "Created By"); // will return the properties of the thing that is held by this field/property that belongs to the first object, in this example "support4" and also print the specified field.

How in the world do I do anything with a List of Things?

@NigelG@levon@yusaney1@jarrad@copilot tagged you guys because you’re my search reference here in the forums when I want to breakthrough an issue that is setting back progress for days!
Shoutout to Salar on Cobubble, or whoever made the plugin course, because that course was an awesome shortcut and skipped me a lot of headache!

Yeah! Actually that was the only message that made sense to me in all the error log.

I made sure that the field had value(s) in it by filling the List of Things with some Things through the Bubble app. Then in the plugin editor I tried to obtain these values using the built-in instructions that shows up in the “documentation” near the code box, to no avail.

Maybe a sample code that successfully works with the List of Things would help me. I tried to find in another open plugins but could not find.

I think I’m a bit of a door today. I still can’t get it, even tried the code you supplied and tried modifying it but got the same issue. I thought we were supposed to work with a List of Things in the same way we work with a List of Texts.

Ok i did some test for you and this is what i found.
Yes you’re right. Bubble always throws an error when you define a field of type List of any thing.
I haven’t really used the any thing type before so maybe i’m missing something.

But even if you don’t have any code at all in your action function, you will still get that error.
Try this.
Just create a field and make the type list of any thing. Don’t add any code at all.
In you test app just add a button and call that function. You will get the same error.

Unless someone knows whats going on i’m inclined to say this may be some bug.
Because when you use the get function as i explained above with any other list types like date, text ,etc it works.

So maybe consider filling a bug report if no one comes up with an explanation.

Thank you for your time! I initially filled this as a bug report, then got asked to bring it here first and if no solution arised, to bring it back to them so they could take another look. Will bring it back to them with a link to this thread and see what happens.